Hydraulic hoisting machinery



(No Modl.)

A. LAFARGUB.

HYDRAULIC HOISTING MACHINERY.

`Pafoerlfwd June 6, 1882.

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UNITED STATES ALPHONSE LAFARGUE, OF KENSINGTON, COUNTY OF MIDDLESEX,ENGLAND.

' PATENT OFFICE.

HYDRAULIC HOISTING MACHINERY.

SPECIFICATION forming part of Letters Patent No, 259,175, dated June 6,1882.

Application filed May 11, 1881. (No model.) Patented in England May 25,1877, No. 2,045, and May 25, 1880, No. 2,122.

braced in British Letters Patent No. 2,122,`

granted to me May 25, 1880, and in British Letters Patent No. 2,045,granted to me and,

Claude Martin, May 25, 1877. Y

My invention relates to a crane comprising a cylinder which forms themain pillar or column of the crane, and a piston tting in said cylinderand attached to an extensible column or pillar which carries a sheave,and the raising of which eectsthelifting. The aforesaid piston has itstwo sides of different area, and the invention consists in thecombination, with the aforesaid cylinder and piston, of a novelarrangement of valves, hereinafter particularly described and claimed,and which may be adjusted to cause the water-pressure to act only 0n theside of the piston which is of larger area when a heavy load is to belifted, or to cause pressure to act on both sides ofthe piston when alight load is to be lifted, in which latter case the lifting-power willbe proportionate to the difference in area between the two sides ofthepiston.

In the accompanying drawings, Figure 1 represents a central verticalsection of a crane embodying my improvements, and Fig. 2 represents apartly-section al elevation at right angles to Fig. 1.

Similar letters ot' reference designate corresponding parts in both thefigures.

- b designates the lower or base'portion ot' the central column orpillar of the crane, which is fitted in a stop-bearin g at b andabearing, b2,

in the deck B. At the upper end of the sec` tion or portion b is a valvebox or chamber, b3, and upon the top thereof is mounted a cylinder, a,which forms the upper portion of the by the piston e. The upper end ot'the extensible column or pillar c is bifurcated or forked, and in thesaid end is litted a sheave, E.

F designatesthe boom or jib of the crane, which is provided with aroller, s, bearing upon a circular track around the column b, and theouter end of which is supported by a suspension-brace or tie-rod, s',extending from the top of the cylinder a to the outer end of the boom orjib F.

G G! designate two tackle-blocks or pulleyslthe former pivoted in theboom or jib F and the latter attached to the end of a cable, t, whichpasses around the sheave E and has its other end secured at c. The cablet', which is rove upon the tackle-blocks Gr G', passes outward and overa pulley or sheave, t2, at the end of the boom or jib, and thencedownward to a hook or suspension device, t3:

From the above it will be clearly seen that the raising ot the piston eand sheave E will raise the tackle-block G and'eft'ect the lifting ofgoods, While the lowering of said piston and sheave will have theopposite effect.

I will now describe the mechanism for controlling the admission of waterto the cylinder a.

Water or other liquid is suppliedV through a pipe, j, from a pump orother source of supply to the bottom of the column or pillar b, andthence passes upward through a pipe, c, to a valve, d, the plug of whichmay be oscillated bya lever, f. This valve communicates by means of apipe, d', with the cylinder a below the piston e, and by means of apipe,j', and passage jz with said cylinder above the piston e. In thepipe j is a valve or cock, 7L, which may be operated by a lever, h', topermit the liquid to pass directly through it, or to cut olifcommunication between the valve d and thezpassagej2 and permit the waterto be discharged from above the piston e, through the exh aust-pipe t',into the pillar b, from which the waste liquid is discharged through apipe, g.

When alight weight is to be lifted the cock h is adjusted so as topermit of the free passage of water above the piston e, and the valve dbeing properly adjusted, the liquid under pressure will pass to thecylinder c above and below the piston e, and the eii'ective pow- IOO erexerted will be proportioned to the difference in area between the twosides of the piston e, adapting the crane for light weights. If,however, the cock h be adjusted to permit the liquid from above thepiston e to be exhausted through the pipe t', the valve h may beadjusted so as to supply liquid only below the piston e through the piped', and the power exerted will be proportioned to the area of the underside of the piston e, adapting the crane for heavy weights. In lowering,the cock d is adjusted to permit of the liquid being discharged frombelow piston e through the pipe g.

The cylinder a and the piston e, the two sides ot' which are ofdifferent area, might be employed in other hoisting 0r lifting apparatusthan that represented.

What I claim as my invention is 1. The combination, with the cylinder aand piston e, having its two sides of different area, of the valve d,pipes leading therefrom to said cylinder on both sides of said piston,and the valve h in the pipe leading to the cylinder on the side ofthepiston which is of smaller area, and adapted to be closed to allowliquid to escape from the cylinder on that side ofthe piston, or openedto permit the pressure to act o n both sides of said piston,substantially as specified.

2. The combination of the cylinder a, the piston e, the extensiblecolumn a', the sheave E, carried thereby, the valves d h, the boom or jib F, adapted to be adj usted around said column, the block G in theboom orjib, the cable t, passing over the sheave E,the movable block G',suspended by said cable, and the cable t, rove upon the blocks G G', allsubstantially as specified.

ALPHONSE LAFARGUE.

Witnesses:

G. W. WESTLEY, 17 Gracechuch St., London.

J. G. TONGUE, 34 Southampton Buildings, London, lV. Cf'.

